[Downloads] Always call DM::StartDownload() for explicit downloads.

chrome/browser/download/download_target_determiner.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/download/download_target_determiner.h"
 
 #include "base/location.h"
 #include "base/rand_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
@@ skipping 222 matching lines @@
   } else {
     virtual_path_ = download_->GetForcedFilePath();
     // If this is a resumed download which was previously interrupted due to an
     // issue with the forced path, the user is still not prompted. If the path
     // supplied to a programmatic download is invalid, then the caller needs to
     // intervene.
   }
   DCHECK(virtual_path_.IsAbsolute());
   DVLOG(20) << "Generated virtual path: " << virtual_path_.AsUTF8Unsafe();
 
-  // If the download is DOA, don't bother going any further. This would be the
-  // case for a download that failed to initialize (e.g. the initial temporary
-  // file couldn't be created because both the downloads directory and the
-  // temporary directory are unwriteable).
-  //
-  // A virtual path is determined for DOA downloads for display purposes. This
-  // is why this check is performed here instead of at the start.
-  if (download_->GetState() != DownloadItem::IN_PROGRESS)
-    return COMPLETE;
   return CONTINUE;
 }
 
 DownloadTargetDeterminer::Result
     DownloadTargetDeterminer::DoNotifyExtensions() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(!virtual_path_.empty());
 
   next_state_ = STATE_RESERVE_VIRTUAL_PATH;
 
-  if (!should_notify_extensions_)
+  if (!should_notify_extensions_ ||
+      download_->GetState() != DownloadItem::IN_PROGRESS)
     return CONTINUE;
 
   delegate_->NotifyExtensions(download_, virtual_path_,
       base::Bind(&DownloadTargetDeterminer::NotifyExtensionsDone,
                  weak_ptr_factory_.GetWeakPtr()));
   return QUIT_DOLOOP;
 }
 
 void DownloadTargetDeterminer::NotifyExtensionsDone(
     const base::FilePath& suggested_path,
@@ skipping 27 matching lines @@
 
   DoLoop();
 }
 
 DownloadTargetDeterminer::Result
     DownloadTargetDeterminer::DoReserveVirtualPath() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(!virtual_path_.empty());
 
   next_state_ = STATE_PROMPT_USER_FOR_DOWNLOAD_PATH;
+  if (download_->GetState() != DownloadItem::IN_PROGRESS)
+    return CONTINUE;
 
   delegate_->ReserveVirtualPath(
       download_, virtual_path_, create_target_directory_, conflict_action_,
       base::Bind(&DownloadTargetDeterminer::ReserveVirtualPathDone,
                  weak_ptr_factory_.GetWeakPtr()));
   return QUIT_DOLOOP;
 }
 
 void DownloadTargetDeterminer::ReserveVirtualPathDone(
     const base::FilePath& path, bool verified) {
@@ skipping 16 matching lines @@
   DoLoop();
 }
 
 DownloadTargetDeterminer::Result
     DownloadTargetDeterminer::DoPromptUserForDownloadPath() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(!virtual_path_.empty());
 
   next_state_ = STATE_DETERMINE_LOCAL_PATH;
 
-  if (should_prompt_) {
+  // Avoid prompting for a download if it isn't in-progress. The user will be
+  // prompted once the download is resumed and headers are available.
+  if (should_prompt_ && download_->GetState() == DownloadItem::IN_PROGRESS) {
     delegate_->PromptUserForDownloadPath(
         download_,
         virtual_path_,
         base::Bind(&DownloadTargetDeterminer::PromptUserForDownloadPathDone,
                    weak_ptr_factory_.GetWeakPtr()));
     return QUIT_DOLOOP;
   }
   return CONTINUE;
 }
 
@@ skipping 217 matching lines @@
   g_is_adobe_reader_up_to_date_ = adobe_reader_up_to_date;
   DoLoop();
 }
 #endif
 
 DownloadTargetDeterminer::Result
     DownloadTargetDeterminer::DoCheckDownloadUrl() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(!virtual_path_.empty());
   next_state_ = STATE_CHECK_VISITED_REFERRER_BEFORE;
+
   delegate_->CheckDownloadUrl(
       download_,
       virtual_path_,
       base::Bind(&DownloadTargetDeterminer::CheckDownloadUrlDone,
                  weak_ptr_factory_.GetWeakPtr()));
   return QUIT_DOLOOP;
 }
 
 void DownloadTargetDeterminer::CheckDownloadUrlDone(
     content::DownloadDangerType danger_type) {
@@ skipping 328 matching lines @@
     const base::FilePath& suggested_path) {
   return base::FilePath(suggested_path.value() + kCrdownloadSuffix);
 }
 
 #if defined(OS_WIN)
 // static
 bool DownloadTargetDeterminer::IsAdobeReaderUpToDate() {
   return g_is_adobe_reader_up_to_date_;
 }
 #endif